Make services.core the final priorityboosted jar

Other module besides services depend on services.core, and after
I417409281c928ea667d937090d2a0d9d72a449a2 they were getting
the non-priorityboosted version of the jar.  Make services.core
a java_library that contains the output of the priorityboosting
java_genrule.

Test: m services
Change-Id: Ic9ca1b8f43f87b0d7d36b53bbc5136a331490c3e
diff --git a/services/Android.bp b/services/Android.bp
index 5e75c37..d125adc 100644
--- a/services/Android.bp
+++ b/services/Android.bp
@@ -14,7 +14,7 @@
 
     // The convention is to name each service module 'services.$(module_name)'
     static_libs: [
-        "services.core.priorityboosted",
+        "services.core",
         "services.accessibility",
         "services.appwidget",
         "services.autofill",